Bald Mountain Mine

The Bald Mountain Mine is a gold and silver mine located in White Pine county, Nevada at an elevation of 7,149 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Bald Mountain Mine
Secondary: Top Deposit
Secondary: Rbm Deposit
Secondary: Rat Deposit
Secondary: North Deposit
Secondary: Bf Claim Group
Secondary: NBMG Samples 4375, 4376, 4377.

Commodity

Primary: Gold
Primary: Silver
Tertiary: Copper
Tertiary: Zinc
Tertiary: Arsenic
Tertiary: Antimony
Tertiary: Mercury
Tertiary: Bismuth
Tertiary: Tellurium

Location

State: Nevada
County: White Pine
District: Bald Mountain

Land Status

Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Placer Dome U. S.

Production

Year: 1988
Material type: AU
Description: Ap_Grade: ^0.063 Opt Au
Year: 1987
Material type: ORE-AU
Description: Ap_Grade: ^0.062 Opt Au
Year: 1985
Material type: AU
Description: Ap_Grade: ^0.086 Opt Au

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1983
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Basin And Mountains

Mineral Deposit Model

Model Name: Distal disseminated Ag-Au

Orebody

Not available

Structure

Type: L
Description: See Ore Control.

Alterations

Alteration Type: L
Alteration Text: Silicification, Argillization, Potassic Alteration. See Geology Comments.

Rocks

Name: Granite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Cambrian

Analytical Data

Not available

Materials

Gangue: Quartz
Gangue: Pyrite

Comments

Comment (Deposit): First Production Year: 1983 (PILOT SCALE); 1986 (FULL SCALE)

Comment (Commodity): THE TOP AND RBM DEPOSITS BOTH HAVE HIGH CU, ZN, AND AG CONTENTS ASSOCIATED WITH AU MINERALIZATION AS WELL AS ANOMALOUS VALUES IN BI, HG, AS, SB, AND TELLURIDES. RAT AND NORTH DEPOSITS HAVE LOW TO NON-EXISTENT BASE METAL SIGNATURES WITH HIGHER HG, AS, AND SB VALUES.

Comment (Location): UTM'S TO TOP PIT; PREVIOUS QUAD DESIGNATION = ELY (1971) 1:250000

Comment (Development): PLACER BEGAN EXPLORATION ON THE PROPERTY IN 1977. IN 1983, A 2 MONTH, $1.96 MILLION HEAP LEACH TEST PRODUCED 3500 OZ. AU FROM 66,000 ST OF ORE. IN 1985, TEST MINING AND HEAP LEACH OPERATIONS WERE CONDUCTED, A FINAL FEASIBILITY DECISION WAS MADE, AND THE PERMITTING PROCESS WAS COMPLETED. BALD MOUNTAIN MINE WAS CONVERTED FROM PILOT SCALE TO FULL SCALE PRODUCTION IN 1986. STAGE III DEVELOPMENT OF THE TOP OREBODY COMMENCED IN MID-1987 WITH A THIRD MINE SHIFT REQUIRED TO HANDLE INCREASED MINE PRODUCTION. ALSO IN 1987, THE LEACH PAD WAS EXPANDED BY 180,000 SQUARE FEET AND 3 PROCESS SOLUTION PONDS WERE LINED WITH ARTIFICIAL MEMBRANE MATERIAL TO CONTAIN AU-BEARING SOLUTIONS. IN 1988, THE TOP OREBODY PROVIDED MOST OF THE HEAP LEACH FEED, WHILE THE RBM DEPOSIT WAS PLACED INTO PRODUCTION LATE IN THE YEAR. ALSO IN 1988, 5 ADDITIONAL CARBON COLUMNS WERE INSTALLED AND NEW LEACH PAD CONSTRUCTION ADDED 680,000 SQUARE FEET OF LEACHING AREA. TOTAL$: 12; ECON.YEAR: 1986. ; ECON.COM: CASH PRODUCTION COST

Comment (Development): PER OZ. OF AU WAS $256 IN 1987, $273 IN 1988, $252 IN 1989, AND $218 IN 1990. TOTAL PRODUCTION COST PER OZ. OF AU WAS $297 IN 1987, $320 IN 1988, $305 IN 1989, AND $289 IN 1990.

Comment (Workings): PRODUCTION HAS COME FROM FOUR PITS: TOP, RBM, RAT, AND NORTH.

Comment (Geology): ALTERATION COMMENTS: SILICIFICATION, ARGILLIZATION, POTASSIC ALTERATION. THE MAIN ALTERATION FEATURE AT BALD MOUNTAIN IS THE LARGE HALO OF SILICIFICATION AND STRONG ARGILLIZATION. POTASSIC ALTERATION IS RECOGNIZED AT DEPTH. GEOLOGY COMMENTS: HOST ROCKS ARE CALCAREOUS SHALES AND DARK GRAY LIMESTONES WHICH WEATHER TO IRON-OXIDE STAINED RED-BROWN-MAROON AND TAN COLORS. GRANITIC INTRUSIVE WITH QUARTZ PHENOCRYSTS AND OXIDIZED PYRITE WAS NOTED IN CUT FACE OF DRILL ROADS.

Comment (Deposit): DO NOT CONFUSE BALD MOUNTAIN MINE WITH LITTLE BALD MOUNTAIN MINE (MRDS RECORD W700447).

References

Reference (Deposit): HILL, J. M., 1916, NOTES ON SOME MINING DISTRICTS IN EASTERN NEVADA, USGS BULL. 648, P. 152-161.

Reference (Deposit): HOSE, BLAKE, AND SMITH, 1976, GEOLOGY AND MINERAL RESOURCES OF WHITE PINE COUNTY, NEVADA, NBMG BULLETIN 85.

Reference (Deposit): DEAN, D. A., BENEDETTO, K. M. F., DURGIN, D. C., 1991, PART TWO: ELY - BALD MOUNTAIN - ELY ROAD LOG, IN BUFFA, R. AND COYNER, A., EDS., GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN - FIELD TRIP GUIDEBOOK COMPENDIUM, THE GEOLOGICAL SOCIETY OF NEVADA, RENO, P. 136-162.

Reference (Deposit): LOWE, N. T., RANEY, R. G., AND NORBERG, J. R., PRINCIPAL DEPOSITS OF STRATEGIC AND CRITICAL MINERALS IN NEVADA, USBM INFORMATION CIRCULAR 9035, P. 75.

Reference (Deposit): A STUDY OF ACTIVE U. S. GOLD MINES, JULY, 1986, METALS ECONOMICS GROUP, BOULDER, CO, P. 288-291.

Reference (Deposit): PLACER DOME INC., ANNUAL REPORT FOR 1987.

Reference (Deposit): PLACER DOME INC., ANNUAL REPORT FOR 1988.

Reference (Deposit): PLACER DOME INC., ANNUAL REPORT FOR 1989.

Reference (Deposit): PLACER DOME INC., ANNUAL REPORT FOR 1990.

Reference (Deposit): BONHAM, H., BENTZ, J., AND SMITH, P., 1981, FIELD EXAMINATION, JUNE 28, 1981.

Reference (Deposit): NBMG, 1982, OPEN FILE REPORT 82-9.

Reference (Deposit): PAY DIRT, OCT, 1982.

Reference (Deposit): NEVADA MINING ASSOCIATION BULLETIN, 1983.

Reference (Deposit): DIVISION OF MINE INSPECTION, 1983, DIRECTORY OF NEVADA MINING OPERATIONS ACTIVE DURING CALENDAR YEAR 1983.

Reference (Deposit): JONES AND PAPKE, 1984, ACTIVE MINES AND OIL FIELDS IN NEVADA - 1983, NBMG MAP M84.

Reference (Deposit): NBMG, 1994, MI-1993

Reference (Production): 1983 FIGURES: A STUDY OF ACTIVE U. S. GOLD MINES, JULY, 1986, METALS ECONOMICS GROUP, BOULDER, CO, P. 288-291. 1985-1987 FIGURES: PLACER DOME INC., ANNUAL REPORT FOR 1987. 1988-1990 FIGURES: PLACER DOME INC., ANNUAL REPORT FOR 1990. NBMG MI-1993

Reference (Reserve-Resource): NBMG MI-1993

Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.